Cameron Diaz & Diddy Get 'Affectionate' at Rooftop Bash

Nearly a month after they were spotted together at lunch, Cameron Diaz and Diddy are keeping those dating rumors alive after a cozy night out at New York's PH-D Rooftop Lounge atop the Dream Downtown Hotel. The actress started her night at Marble Lane Restaurant with a large group of friends before heading up to the roof after midnight. Diddy joined their table around 1:15, and ordered bottles of booze for the table, where Diaz was dancing with her friends and drinking, too. According to a source, the table was packed and "Cameron and Diddy were very affectionate." Still, a rep says the two, who left the club with their friends around 3:15 a.m., are not an item. "They are friends and are not dating," the actress's rep tells PEOPLE. – Carlos Greer and Julie Jordan